An unclassified term referring to technical investigations for compromising emanations from electrically operated information processing equipment; these investigations are conducted in support of emanations and emissions security. See also counterintelligence. (JP 2-01.2)

Tempest (codename), a standard of shielding for wires and computers used by the U.S. and other governments

A brand operated by the department store Menarys

Tempest, the watermelon flavor of the chewing gum 5 in Australia and New Zealand

Tempest in a teapot

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TEMPEST is a National Security Agency specification and NATO certification referring to spying on information systems through leaking emanations, including unintentional radio or electrical signals, sounds, and vibrations. TEMPEST covers both methods to spy upon others and also how to shield equipment against such spying. The protection efforts are also known as emission security (EMSEC), which is a subset of communications security (COMSEC).

(v. t.)
To disturb as by a tempest. (v. i.)
To storm. (n.)
Fig.: Any violent tumult or commotion; as, a political tempest; a tempest of war, or of the passions. (n.)
An extensive current of wind, rushing with great velocity and violence, and commonly attended with rain, hail, or snow; a furious storm. (n.)
A fashionable assembly; a drum. See the Note under Drum, n., 4.

1. [A] Short name referring to investigation, study, and control of compromising emanations from telecommunications and automated information systems equipment. [NIS] (188 ) 2. To shield against compromising emanations.